Companies like W.Y. Industries started mass-producing packets of soy sauce, mustard, hot sauce, and duck sauce, and by the 1990s, they were making hundreds of millions every year. Even though it's ...

Add the cream, Worcestershire sauce and mustard. Season with salt and pepper. Boil for 1 minute, then add the lemon juice, chopped watercress and any duck cooking juices. Reduce the heat and ...